AP Police Constable practice question
Find the sum of the first 40 terms of the arithmetic progression 19, 25, 31, ….
From a AP Police Constable Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 5440
a = 19, d = 6, n = 40. Sₙ = n/2 × [2a + (n − 1)d] = 40/2 × [38 + 39 × 6] = 40/2 × 272 = 5440.
हिंदी में प्रश्न
समांतर श्रेढ़ी 19, 25, 31, … के प्रथम 40 पदों का योग ज्ञात कीजिए।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 5440
a = 19, d = 6, n = 40। Sₙ = n/2 × [2a + (n − 1)d] = 40/2 × [38 + 39 × 6] = 40/2 × 272 = 5440।
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